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By Joanna Marchant A MUTANT gene that increases the risk of a common type of testicular cancer fifty-fold has been located by an international team of geneticists. Testicular germ-cell cancer is the commonest cancer among young males in Western Europe. Men inherit TGCT1, the gene linked to this form of cancer, from their mothers. Its discovery was announced in London this week by three of Britain’s leading cancer research charities. Looking for the gene was complicated,